Diagnostic Procedure

RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws. See Figure .
1. : GO TO 2.
CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect PSP sensor harness connector.
2. Turn ignition switch ON. See Figure
3. Check voltage between PSP sensor terminal 1 and ground with CONSULT-II or tester.
  Voltage: Approximately 5V
  
  Fig 1: Checking Voltage Between PSP Sensor Terminal 1 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Repair harness or connectors.
CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between PSP sensor terminal 3 and engine ground.
  Refer to Wiring Diagram.
  
  Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK: GO TO 5 .
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between ECM and PSP sensor
- Harness for open or short between TCM (Transmission Control Module) and PSP sensor.
1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 89 and PSP sensor terminal 2.
  Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 6.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK PSP SENSOR
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 7.
2. NG: Replace PSP sensor.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. : INSPECTION END